Fungous diseases of plants . alinc, considerably septate, and often showclamp connections when growing in the vessels. They grow morequickly in the vessels, but are not ultimately assembled into strandsin these parts. The wood is eventually separated into plates orcuboidal areas, and the texture of the wood becomes light and separation of the wood into plates is accomplished by thegrowth of white strands or bands of the mycelium in all three direc-tions, that is, radially, tangentially, and longitudinally. The woodelements, which gradually disappear under the solvent action of. Fig.
Fungous diseases of plants . alinc, considerably septate, and often showclamp connections when growing in the vessels. They grow morequickly in the vessels, but are not ultimately assembled into strandsin these parts. The wood is eventually separated into plates orcuboidal areas, and the texture of the wood becomes light and separation of the wood into plates is accomplished by thegrowth of white strands or bands of the mycelium in all three direc-tions, that is, radially, tangentially, and longitudinally. The woodelements, which gradually disappear under the solvent action of. Fig. 224. PoLi-poRcs sqcimosus. Upper Surface the fungus, are largely those which are less lignified, such as thefibers between the vessels, that is, those usually produced only dur-ing spring growth. In the dissolution of the cells, first the contents,next the secondary cellulose layer, and finally the middle lamellaedisappear, so that during the process the cells do not become sepa-rated in the early stages of decay. The mycelium unquestionably possesses a variety of to Buller, from an enzymotic study of wood undergoingdecay from the agency of Polyponis squaviosus evidence was takenthat various enzymes are excreted by the fungus mycelium. Thus 456 FUNGOUS DISEASES OF PLANTS the disappearance of starch, proteids, and cellulose suggests thatthe fungus produces amylolytic, proteolytic, and cyteolytic direct study of this point was attempted by making extractionsfrom fresh, young fruit bodies, and testing these. While this may not be an absolute criterion for
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